You want the (positive) distance when the height is 0, 0= -d^2 + 10d +5.
You would factor that out(You'd get radicals), and the final answer would be
<span>5±<span>30<span>−−</span>√</span></span><span>
You'd take the only positive one of the two, 5 + srt(30)
I hope I did that right :/</span>
This is simple simplifying. If you need an explanation dm me.
here is the answer
x=-5
Answer:
a) sample size is 40
Step-by-step explanation:
(a)
minutes
Margin of error, E is 75 seconds E=75/60= 1.25 minutes.
The level of significance 
for 95% level of significance
For 95% confidence interval 
from standard deviation table
Sample size required, n
Rounding off, n=40
Sample size =40
Keywords:
95% confidence, sample size, Wall Street Journal
Answer:
42
Step-by-step explanation:
We know that 10x + 6y = 7, and so
6(10x + 6y) = 6(7) = 42
Answer: $2215
Step-by-step explanation:
For the past 5 weeks, Mandy adds $291 each week to her account. This gives $291×5= $1455
Money received on birthday= $313
Money started with in the account= $527
Total money in Mandy's account will be= $1455+$313+$527 = $2295
The total amount in Mandy's account is $2215
